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Method for cyclic regeneration of magnesium alkylation reaction catalyst

A technology of catalyst circulation and chemical reaction, applied in the direction of catalyst regeneration/reactivation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as waste of resources, achieve no secondary pollution, high environmental and economic value, Avoid the effects of processing

Pending Publication Date: 2021-05-28
HEBEI UNIV OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a method for the recycling and regeneration of magnesium-based alkylation reaction catalysts, which solves the problem of wasting resources by direct processing of spent magnesium oxide catalysts

Method used

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  • Method for cyclic regeneration of magnesium alkylation reaction catalyst
  • Method for cyclic regeneration of magnesium alkylation reaction catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Such as figure 1 As shown, take 40 grams of spent magnesium oxide catalyst, after drying at 80 degrees Celsius, put it into a ball mill and pulverize it to more than 80 mesh. Put the pulverized spent magnesium oxide catalyst into a muffle furnace for calcination, the calcination temperature is 450 degrees centigrade, and the calcination time is 4 hours. Put the calcined magnesium oxide powder into a 1000 ml flask, add 500 ml of deionized water at a temperature of 80 degrees Celsius, and stir for 1 hour at a constant temperature of 80 degrees Celsius in a water bath. Then at a constant temperature of 80 degrees Celsius, the stirring speed was adjusted to 400 rpm, and carbon dioxide gas was introduced into the slurry, and the flow control of carbon dioxide was 100 milliliters per minute. Stirring was continued for 4 hours, and then the slurry was filtered with a vacuum pump to obtain a filter cake. The filter cake was dried in a drying oven at 80 degrees Celsius for 10 ...

Embodiment 2

[0031] Weigh 60 grams of spent magnesia catalyst, dry it at 80 degrees centigrade, put it into a ball mill and pulverize it to more than 80 mesh. Put the pulverized spent magnesium oxide catalyst into a muffle furnace for calcination, the calcination temperature is 500 degrees centigrade, and the calcination time is 4 hours. Put the calcined magnesium oxide powder into a 1000 ml flask, add 600 ml of deionized water at a temperature of 80 degrees Celsius, and stir for 1 hour at a constant temperature of 80 degrees Celsius in a water bath. Then at a constant temperature of 80 degrees Celsius, the stirring speed was adjusted to 300 revolutions per minute, and carbon dioxide gas was introduced into the slurry, and the flow control of carbon dioxide was 200 milliliters per minute. Stirring was continued for 6 hours, and then the slurry was filtered with a vacuum pump to obtain a filter cake. The filter cake was dried in a drying oven at 80 degrees Celsius for 10 hours to obtain a ...

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Abstract

The invention provides a method for cyclic regeneration of a magnesium alkylation reaction catalyst, and relates to the technical field of resource utilization of industrial waste residues. The method for cyclic regeneration of the magnesium alkylation reaction catalyst comprises the following specific operation steps: drying and crushing a waste magnesium oxide catalyst, roasting the crushed waste magnesium oxide catalyst, removing deposited carbon, adding the roasted material into deionized water, conducting stirring at a constant temperature to obtain slurry, introducing a proper amount of carbon dioxide into the slurry under high-speed stirring, and then conducting filtering to obtain a filter cake; and taking a powdery solid obtained after the filter cake is dried as a precursor, adding auxiliaries such as copper and graphite, and conducting granulation and tabletting, so as to obtain a regenerated catalyst. According to the method, the used waste magnesium oxide catalyst can be effectively recycled, and waste is turned into wealth; the magnesium compound is subjected to structural transformation by adopting carbon dioxide, so that the consumption of acid and alkali is saved, and the treatment of salt-containing wastewater is further avoided; and the method is simple in process, harmful substances are effectively controlled in the whole process, and the method has high environmental and economic values.

Description

technical field [0001] The invention relates to the technical field of resource utilization of industrial waste residues, in particular to a method for recycling and regenerating magnesium-based alkylation reaction catalysts. Background technique [0002] Alkylated hydroxyaromatic compounds have a variety of uses. For example, o-cresol, which is produced by the gas phase reaction of phenol and methanol, can be used as a disinfectant and antiseptic. Alkylation of phenol with methanol can also produce 2,6-dimethylphenol, which is a monomer for polymerization to produce polyphenylene ether resin. Efficient alkylation catalyst is the key to industrial production of 2,6-dimethylphenol, and also one of the key technologies for industrial production of polyphenylene ether resin. Magnesium oxide monomer catalyst is one of the most important catalysts for synthesizing 2,6-dimethylphenol in industry because of its simple preparation process and low price. [0003] Magnesium-based a...

Claims

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Application Information

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IPC IPC(8): B01J38/02B01J38/04B01J38/00B01J23/78
CPCB01J38/02B01J38/04B01J38/00B01J23/78Y02P20/584
Inventor 岳义智王选利
Owner HEBEI UNIV OF ENG
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